Problem #10
Population Mean () = 62
Population Std Dev () = 15
Sample Size (n) = 36
Mue () of X Bar = 62
of X bar = / sqrt (n) 2.5
a)
Find Z for an X bar = 55
Z = -2.8
b)
Find Z for an X bar = 60
Z = -0.8
c)
Find Z for an X bar = 65
Z = 1.2
d)
Find Z for
Operating Performance Ratios:
Profit Margin
- Indicates a firms ability to convert sales into earnings (AKA return on sales)
= Net Income
Net Sales
Gross Margin
- Indicates the average percentage by which the sales price of a companys goods or services ex
FORMAT OF MID-TERM EXAM
THE EXAM WILL CONSIST OF SIX (6) PROBLEMS
(One Take-Home Problem & Five In-Class Problems)
EXAM QUESTION
TOPIC
ONE PROBLEM
SAMPLING DISTRIBUTION
(PROBLEMS -10, 12, 14, 20, 26, 28)
ONE PROBLEM
ESTIMATION FROM SAMPLING DATA
(PROBLEMS
Problem 26
a)
Left Tail Test
Zcalc = -1.62
P(Z</= -1.62)
What is p value?
b)
Right Tail Test
Zcalc = 1.43
P(Z 1.43)
What is p value?
c)
Two Tail Test
Zcalc = 1.27
= 2*(P 1.27)
What is p value?
0.0526161385 NORMSDIST
0.9236414905 NORMSDIST
0.0763585095 1-N